The Mongol army left the camp two miles outside the city of Changshu, surrounded the city, dug a trench in front of the camp to prevent the Song army in the city from raiding, arranged foothills and horses, and lit bonfires. In fact, who can see that this defense line is very poorly built, the trench is only two feet deep and three feet wide, not to mention that even people can jump over the war horses. And the sparse foothills and rejected horses may not even be able to stop the pigs.

Of course, this is not Meng Yuan's carelessness or laziness, but deliberately, they want the food and military materials stored in the city, not this city, so they wish the Song army broke through! Today, the Mongolian army used almost all the means at its disposal, and the bounty also rose again and again, but it still failed to succeed, and the casualties were not small. Therefore, it is hoped that the Song army will be 'forced' by the strong pressure of the siege, take advantage of the flaws in the defense line to break through and abandon the city.

The time had passed, and the Mongol army did not look forward to the breakthrough of the Song army, and a day of fierce fighting, coupled with days of rapid marching, also made them physically and mentally exhausted. The camp had long been silent, leaving only the sentinels on duty to look at the city in front of them, and in the silent night, in addition to the sound of the wind, there were faint cries for help and miserable howls from time to time, which were issued by their own soldiers who were seriously injured during the siege and did not have time to take them back. The mournful cry made the sentinels feel awe-inspiring in their hearts, but as time went by, they became weaker and weaker, and finally fell silent.

'Boom, boom, ......boom' suddenly heard a few dull explosions, like thunder on a spring day, which lifted the spirits of the sleepy sentinels and hurriedly looked for prestige, but saw two fire dragons rising in the direction of Yushan Mountain on the edge of the city, dragging a long tail flame, making a terrible roar, and attacking in the direction of their camp.

"Enemy attack, enemy attack......" Sentinels everywhere noticed the anomaly, shouting and ringing the alarm bell to warn. And the fire dragon flew very fast, and after reaching the sky above the camp, it plunged down, making a loud noise in the camp, and a dazzling fire was raised. And then more fire dragons rose into the sky, illuminating this moonless night, and in the blink of an eye, countless rockets fell in the camp of the North City, exploding a ball of fire!

The sudden attack from the air plunged the Beicheng camp into chaos, and people got out of their tents one after another, looking up at the rockets flying from the sky, and judging the landing point blankly, hoping to avoid the fatal blow. But there was nowhere to hide in the open wilderness, and when the felt tents were hit, they were reduced to countless fragments, and there was no way to provide them with shelter, and hiding far away seemed to be the best way. The officers also wanted to restore order, but their shouts were faintly heard by the violent explosions, and they could not be organized at all, and they could only be dragged backwards.

"Kill, kill......" The bombardment from the city lasted for about a quarter of an hour, and then gradually subsided, and before the Mongolian soldiers could pack up their ranks, suddenly there was a shout of killing in front of the camp, and a group of black-clothed men jumped up and killed the camp, and the outposts who were still panicking and looking for a place of refuge fell to the ground in the sound of gunfire. They hurried forward, picked out the corners, removed the horses, and rushed into the camp.

"The enemy has attacked the camp!" Someone found out that something was wrong and shouted loudly, but at this time the scene was chaotic, and it could be said that the soldiers could not find the generals, and the soldiers would not be found. There were soldiers who spontaneously resisted, but they were not the enemy soldiers who swarmed up, killed or stabbed with bayonets before they could fight. The Mongol army, unable to organize resistance, ran faster, but they fled, only to find that the Song army that attacked the camp did not chase them at all, but pounced on the catapult position.

When the Song soldiers drove away the remnants of the enemy, they divided a group of people and hung their backpacks on the catapults, even just under them, and then pounced on the next target. The explosion of 'boom, boom, boom' resumed, and the giant-like stone thrower was either blown apart and turned into sawdust, or it fell to the ground with a bang, igniting a fire. The effort did not last long, hundreds of trebuchets had been blown up by the Song army, and those siege vehicles were also destroyed by them, and they were slumped on the ground crookedly, unable to be used anymore.

The Mongolian army also reacted at this time, they didn't want to break through, nor did they intend to annihilate them, the target was those stone throwers. As they hurriedly organized, two red rays of light rose from the ground and exploded in the air. Those Song troops immediately began to retreat under alternate cover, and the rocket artillery fired again at this time, and the Mongolian soldiers who tried to pursue could only retreat helplessly, watching the Song soldiers calmly retreat into the city under the response......

Yuxi Timur soon learned that the Song army had left the city for a night attack, destroying most of the stone throwers and siege engines. As soon as the morning dawned, he came to Beicheng to check the situation, looking at the broken equipment all over the ground, his face became more and more gloomy, and his heart became more and more irritable. The facts verified his judgment that he did not want to believe - the Song army had no intention of abandoning the city to break through, which means that the enemy intended to hold the city, so the plan to easily obtain supplies from the enemy would not be so easily realized.

The siege equipment was destroyed, and today's siege was just a waste of troops, Yuxi Timur was angry, and ordered the monk to be beaten with fifty lashes, and beheaded two centurions who were responsible for guarding the night, so as to deter some scattered soldiers. But he also had to face the facts in front of him and reconsider the siege plan and how to advance if he could not get supplies.

Yuxi Timur knew that not all kinds of wood were suitable for making siege equipment, especially the stone throwing machine was more picky, and the gun carriage and throwing rod required a limited number of varieties to ensure strength and hardness, so as not to break when fired. Siege trucks don't seem to have such strict requirements, but they also need to grow for more than ten years, but they are only a few decades of trees.

At present, in order to build siege equipment, almost all the surrounding miles of trees have been cut down, and in order to obtain enough wood, they must go further away to collect it, which means that more manpower and material resources are needed, and the time they need the most is not enough in a short time. But time has now become the most urgent need of Yuxi Timur, and the key to his plan is to invade Jiangnan when the enemy's Jiangdong forces are empty, seize Changshu City with lightning speed, and obtain material supplies. Then, taking advantage of the time difference required for the Southern Dynasty to learn of the enemy's situation and mobilize troops to encircle and attack Yangzhou, he quickly marched to Lin'an, defeated the few troops left in Gyeonggi of the Southern Dynasty, captured Lin'an, and forced the Southern Dynasty to land at the imperial court.

When the army of the Song army returned to reinforce the general trend has gone, then there is a lot of room for maneuver. But now everything deviated from their own ideas, and they lost their first battle after crossing south. Yuxi Timur understood that in the face of a fortified city that was heavily defended and fought to the death, besieging the city was often the choice of most generals, and camped outside the city to wait for the defenders to run out of food.

However, Yuxi Timur could not afford to waste time, nor was he in the mood. Changshu City is a material reserve point set up by the Song army, which is used to support the combat needs of tens of thousands of Song troops in the lower reaches of the Yangtze River, and the most important thing is food and weapons. On the other hand, he wanted the supplies in the city, and a city that was depleted of supplies also lost the meaning of taking the city for him.

In fact, there are not many means of attacking the city, in addition to breaking the door and seizing the city, there is nothing more than water attack, fire attack, and digging tunnels. The water network around Changshu is crisscrossed, and water attack should be a reliable choice, but the rainy season has not yet arrived, the river water level is shallow, and the moat is connected with the surrounding water system, and it is also a huge project to block all the waterways. In addition, the commanding heights of Yushan were encircled into the city, and they could also rely on it to defend it.

The water attack plan was quickly rejected by Yuxi Timur. First of all, you need to use a trebuchet to throw the fire into the city, but most of the trebuchets are destroyed, unable to form a scale effect, and the possibility of being extinguished in time; Taking a step back, he successfully carried out the fire attack and captured the city, but if he burned down the warehouses in the city, he would not be able to find a place to cry.

After pondering for a while, Yuxi Timur and Zhao Yu thought of a piece, and it was only feasible to dig tunnels. However, there are also unknowns, and the technology of digging tunnels has long been out of the question, but the problem is that this strategy is not impossible. If the walls were built on solid rock, it would be impossible to dig tunnels underneath. If there is a moat outside the walls, or if the soil under the ground is soft or flooded, it is also not suitable for digging tunnels.

Moreover, even if the conditions for excavation are ideal, the conditions of the excavators themselves are far from ideal: the environment in which they work is dark, damp and dangerous – if the soil above their heads suddenly collapses, then the tunnels they dig will become their own graves. Moreover, it is not easy to dig tunnels in peaceful conditions, and it is even more dangerous in the environment of war.

After all, the besieged side will stop at nothing to block the diggers' progress. Before starting the excavation, the diggers try to get close to the proposed excavation site and try to avoid the rain of arrows from the other side. For this reason, they also have to take advantage of the cover of the equipment and move forward cautiously. Even underground, diggers are still in danger of being attacked, as they dig tunnels to infiltrate the city, not to dig down the entire walls. Otherwise, the amount of work required was too huge, and they still lacked the gunpowder that the Song army had.

Having made up his mind, Yuxi Timur made up his mind while having people build equipment, and at the same time personally surveyed the terrain and chose a place to excavate. Xicheng is built on the mountain, if you want to dig a tunnel from here, it is equivalent to passing through the mountain, even if it is a dirt mountain, I don't know that it will be dug until the year of the monkey to be completed. The east city is close to Qinhu Lake, and there is the Qinchuan Canal, which will be backfilled if it is not possible to dig through the water layer. To the south, there are Shanghu and Kuncheng lakes, which will raise the water table and are not conducive to excavation. Therefore, only the North City is more suitable.

But just when Yuxi Timur decided the next direction of the battle, there was a sudden change in the evening, so that he had to make another change......